Milling-machine.



0. F. SHANK S.

MILLING MACHINE. APPLICATION FILED NOV. 18, 1911.

Patented Mar. 26, 1912.

2 SHEETS-SHEET 1.

G. F. SHANKS.

MILLING MAGHINEV APPLIGATION FILED NOV. 18, 1911.

1 Q21,43Q Patented Mar. 26, 1912 Y Y 2 SHEETS-SHEET 2.

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Alfomeys PM (to-,WASHINo'run D C CHARLES FREDERICK SHANKS, OF JOHNSTONE,SCOTLAND.

MILLING-MACHINE.

Specification of Letters Patent.

, Patented Mar. 26, 1912.

Application filed November 18,1911. Serial No. 661,091.

' To all whom if may concern:

Be it known that I, CHARLES FREDERICK SHANKS, a subject of the King ofthe United Kingdom of Great Britain and Ireland, and residing at Johnstone, Renfrewshire, Scotland, have invented a certain new and useful Improvement in Milling-Machines, of which the following is aspecification.

This invention relates to machines for milling surfaces, e. 9., thesurfaces of armor plates.

The problem of milling broad surfaces by means of a plurality of millingcutter wheels arranged in a line perpendicular to the direction oftravel is coupled with a dif ficulty which arises from the fact that aridge is necessarily left representing the distances between theperipheries of the cutter -wheelswhich distance cannot be decreasedbeyond the limits permitted by the use of engaging gear wheels fordriving the cutters simultaneously. The use of staggered rows of cutterwheels would also be objectionable for the reason that during part ofthe milling operation the milling cutters would be only partlyoperative.

According to the present invention, the difficulties and objectionsabove mentioned are overcome by arranging a plurality of cutter wheelsin a line or lines substantially or presumably at right angles to thedirection of travel, while provision is made for treating the entiresurface to be milled, including the part which would otherwise be leftas a ridge.

In the accompanying drawings Figure 1 is an elevation of a millingmachine equipped with the improved arrangement of cutter wheels: Fig. 2is a part elevation part vertical section showing the cutter wheels andrelative parts detached from the-machine: Fig. 3 is a plan of the cutterwheels and gearing therefor: Fig. 4 shows on an enlarged scale a detailhereinafter referred to.

Referring to the drawings, the cutter wheels A are driven from a commonspur pinion B or the like, each cutter wheel being coaxial with a spurwheel 0, and all the engaging spur wheels O lying in the instance shownin a line at right angles to the direction of travel. The cutter wheelsA are formed, as shown particularly in Fig. 3, with tooth-likeprojections a made to clear each other, and projecting from the teeth ina direction substantially perpendicular to the plane of the wheels A arepreferably detachable cutters D so disposed that the path in which thecutters of one wheel A operate overlaps the path in which the cutters ofan adjacent wheel A operate, said cutters D thus serving to surface thatpart which would otherwise be left as a narrow ridge as aforesaid.

As shown, the spur wheels C and cutter wheels A are secured to shafts Esupported at their upper ends by ball bearings in a frame memberFdisposed transversely of, and adjustably vertically in relation to aframework which includes end standards G and is adapted to be moved in ahorizontal plane relatively to stationary mem bers G serving as a base.An electric motor I is supported at the upper end H of said framework,which motor is adapted, through spur gearing J and bevel gearing Kcarried by said framework, to drive the spur pinion B, which pinion Bcommunicates motion to the spur wheels 0 through spur wheels L and M onshafts N supported between the standards G, the spur wheels M beingslidable relatively to said shafts N so as to permit of verticaladjustment of the frame member F as by means of screwthreaded spindles Orotatably mounted on the standards G and operated from the electricmotor I through a sliding pinion P which imparts movement to spurgearing Q for driving a shaft R connected to the said spindles O bymeans of worm gearing S. The standards G are movable relatively to thestationary base members G by means of screw-threaded spindles G mountedon said members and adapted to be rotated from a shaft T by means ofbevel gearing U, which shaft T is driven by means of bevel gearing V andspur gearing W from an electric motor X.

As shown particularly in Fig. 4, means are provided to permit of axialadjustment of each of the cutter wheels A, said means comprising, forexample, a worm Y, 0perable by a hand wheel Y Fig. 1, and worm wheel Zrotatably mounted on the frame member F, said worm wheel Z being adaptedto rotate a sleeve a freely surrounding the shaft Ebut immovable axiallythereofand in screw-threaded engagement with a fixed bush b, said sleevehaving also a feather-and-groove connection at Z with the worm wheel Z,so that when the wheel Z is rotated the sleeve a is also rotated andmoved axially relatively to the bush 6, thereby moving axially the shaftE.

Having now described my invention what I claim and desire to secure byLetters Patent of the United States is 1. A milling machine comprising,in combination, a framework adapted to be moved in a horizontal plane,and a plurality of rotatable members carried on vertical aXes, avertically adjustable frame member supporting said rotatable members,and which rotatable members include cutting devices so disposed that thepath in which the cutting devices of one rotatable member operateoverlaps the path in which the cutting devices of an adjacent rotatablemember operate.

2. A milling machine comprising, in combination, a framework adapted tobe moved in a horizontal plane, said framework including end standards,a frame member ex tending transversely of said standards, means foradjusting said frame member vertically relatively to said standards, anda plurality of rotatable members carried on vertical axes mounted onsaid frame member, said rotatable members including cut ting devices sodisposed that the path in which the cutting devices of one rotatablemember operate overlaps the path in which the cutting devices of anadjacent rotatable member operate.

3. A milling machine comprising, in combination, a framework adapted tobe moved in a horizontal plane, said framework including end standards,a frame member extending transversely of said standards, means foradjusting said frame member vertically relatively to said standards, aplurality of rotatable members carried on vertical axes mounted on saidframe member, said rotatable members including cutting devices sodisposed that the path in which the cutting devices of the rotatablemember operate overlaps the path in which the cutting devices of anadjacent rotatable member operate, and means for adjusting said rotatingmembers axially relative to said frame member.

4. A milling machine comprising in combination, a framework adapted tobe moved in a horizontal plane, said framework including end standards,a frame member extending transversely of said standards, means foradjusting said frame member vertically relatively to said standards, aplurality of cutter wheels rotatable on vertical axes each Wheel havingtooth-like projections on its periphery, and cutting devices carried onsaid projections and so disposed that the path of movement of thecutting devices on one wheel overlaps the path of movement of thecutting devices on an adjacent wheel.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

CHARLES FREDERICK SHANKS.

Witnesses WALLACE CRANSTON FAIRWEATHER, JOHN TRAIEL STEVENSON.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

